Chuck.



J. KLEINERTZ.

CHUCK.'

APPLICATION FILED DEC. 4. 19m.

1,156,295, Patented OCI.. '12, 1915.

\ r Y j Svw A lmi'/ i STA T'Es PATENT ernten fg.

-, I JULIUs' KLEINERTZ, or BRAUNSFEL'D', :NEAR COLOGNE, @narrativi y.

CHUCK.

, ,y Application lecl December 4, *1914; Serial No. 875,544. l

T0 all whomvz'tfmay concern: l 7

Be' itT known that I, JULIU's' KLEINERTZ, engineer, 'eitizen'of Germany, subject of the King .of Prussia ,and Emperor of Germany, residing at Braunsfeld, near Cologne-on-the- Rhine, in the Kingdom of Prussia and Empire of Germany, have invented new and useful Improvementsv in Chucks, of which the following is a specification.

This inventionrelates. to improvements in chucks, in which cam faces provided on the internal periphery of, a rotatable shell act on jaws working in av slotted body`in the shell, anda primary object is to provide a chuck of this type of increased capacity and simplicity. y

In my improved chuck the cam face for each jaw extends almost over the entire internal periphery of the shell,y so that it is possible to obtain with cam faces cut ata small angle a large movement of the jaws,`

So that the chuck can be employed for tools of various size.V lThe jaws slideinradial slots inthe body of the chuck, and those end faces of"- the jaws which ,contact with the tool slant relatively to the periphery of the tool. y' The jaws are free to make certain movements in thev radial slots, so that when the tool has been inserted and begins to work causes the jaws to turn and to automatif cally grip it more firmly.

' l"of the slot and drive themradially outward.

Another object is to provide that the jaws when at rest are held in a predetermined position, for which purpose springs are provided which press them against the one side A further object is jto prevent the jaws being injured by shavings entering the chuck and settling between the faces slidingon one another;v For this purpose I provide ribs or shoulders on the side of the jaw which norl mal-ly bears against the side Aof the slot.' so

that a clearance is provided between the greater part of the jaw and the `wall-of the slot.

To these and other ends, the invention consists 1in the construction, arrangement and combination of parts describedhereinafter and pointed out in the claims.

-One illustrative Iembodiment of the'invention is represented by way of example 1n the accompanying drawing, wherein Figure l is a central longitudinal sectional view of a chuck according to my-invention taken on the line I-I in F ig. 2, Fig. -2 1s a cross-sectional view 'as seen from below,

Fig. 3 isa longitudinal A`section through the shell -alone showing. particularly lthe cam faces, and fFig. f4 shows ythe three jaws in elevation. Referring to the drawing, the chuck. comprises au, body a adapted to be mounted on the spindle of a drill press or other machine-tool; the annular shell'b, havying at its lower end an inserted cover having a central opening, is rotatably mounted in known manner 'on the said body, the two members being connected by a powerful spring a. The annular cams c, c', d, d

in the embodiment shown 1nand e are serted into' the shell T he body @has three radial slots f in which the three jaws g, la, and z' 'can slide. For guiding thejaws better in the slots each jaw'hasat its upperl end a semifcircu'lar lug lc which exactly lits.;vv d the slot and, projects laterally alittle rbeyond ,ratenteaoet;raisin.

the one side of thejaw, so that shoulders'-.]f;.

are formed. Further, each jaw isprovid'ed approximately in the middleof' the -saine side with a V-shaped rib Z, so that'the jaw can bear with the two projections'jc 'andgl against the side of the/slot. TheJ principal object of this construction lis/fto prevent the side faces of the jaw and the sides of the slots being cut away by shavings which become lodged between the twoparts; such shavings can lie freely between the two parts, so that injury ofthe same'is impossible.

ward the center of the chuck so that each jaw canturn somewhat in its slot aboutv anaxis passing through its head lcnand, when toward the driving sides of the slots.

Similarly shaped lugs g', hand z" are provided below the lugs c on the rear of the jaws and bear against the cam faces of the shell. As shown in Fig. 4, the jaw la.

has besides the lug c only one lug h which coacts with the cam face e. Each ofthe The section of each jaw diminishesfto- I.

action of the springs n and, in' consequence the vtool is inserted the jaws have beveledl faces p. The end of the tool strikes on these M forces the jaws outward 5 always acts i'n the middle and the jaws canl move forward rectilinearly.

'The inner -or front end of each jaw, c'. e.' that located nearest the center of the chuck, v

has a face o, disposed eccentrically to the axis of oscillation of the j aw, which slanting face o contacts with the periphery of the shank of the tool. When the tool is inserted the' jaws g, It and i are pressed by the springs fn,- against the one .side of the slots, but when the tool begins to `-work it turns,

the' individual jaws in their slots against the of the front faces o f the jaws slanting, the

v.tool is. automatically clamped. still more tightly. rlhis clamping action is independent of thevcam .faces of the shell and becomes greater, the greater the working pressure..

At the lower end ofthe chuck into which faces and thereby as far as the position of the cam''faces admits ofsuch movement. Consequently no special device is required for pushing the jaws apart. It will be und rstood from the above that the herein described improved'` chuck is characterized by greatA Vcapacity and simplicity. v j lt is to be understood that changes-and variations within the scope of the appended claims may be made i`n the-described strucbeing normally disposed approximately raditure' Without-departingfrom vthe scope of the invention.

1. In a chuck an annular shelluhaving a plurality of internal cam .faces arranged in different cross-sectional planes, a body hav- 'ingapproximately radial slots and. rotatable 'n said shell, a plurality of'jaws, each mov.-

4able rectilinearly -and rotatably inone of said slots, said jaws having'lugs bearing against said cam faces, the lugs of onejaw lying in different' planes from the lugs of any other jaw and each lug bearing against a separate cam face. '-j s 2. 1nV a chuck, an'annular shell havinga 'i plurality of internal 'cam'faccs arranged 1n diiferent cross-sectional'planes, a body having. approximately' radial 'slots and rotatable in said shell, a.I plurality of jaws,each mov.- able rectilinearly-'and rotatably in-oneof said slots, said jaws having lugs bearingv agamst said cam faces, ly1ng in different 'planes from the lugs of any other jaw and leach lug bearing against a separate cam face, said cam. faces extending around almostthe whole periphery of the Shell.. l V

3. `In va chuck an annular shell having a plurality of internalcam faces arranged in dierent cross-sectional planes, a body having approximately radialslots and rotatable ,in said shell, a plurality of jaws, each movable rectilinearly and rotatably in onefnf said slots, said jaws against said cam faces, the lugs vof one 'jaw lying in different planes from the lugs of any other jaw and each lug bearing against a separate cam face, the jaws being each provided with a guide cam arranged in substantially the same plane.

4. 1na chuck, an annular shell having a plurality of internal cam faces arranged in different cross-sectional planes, a body having approximately radial slots and'rotatable in said shell, a lplurality of jaws, each movable rectilinearly and rotatably in one of said' slots, said jaws` having lugs bearingagainst said cam faces, the lugs of one jaW lying in different planes fromthe lugsof any lother jaw and each lug bearing against a separate camwface, `the side faces of each jaw normally bearing against the side of theslot having projections adapted to prevent a close contact of the surfaces.

5. In a chuck, the' combination'with an annular shell having-a plurality of internal cam faces arranged in different 'cross-sectional planes, Aand a body having approxithe lugs of one jaw.

having lugs bearing icc mately radial slots rotatable in said shell, of

a plurality of jaws of irregular'section each movable rectilinearly and rotatably in oney of-said slots, the one side face of each jaw ally inthe shell', the other side face of each jaw normallybearing against theone side of the slot containing the same, ner fronti'ace of each jaw beingdisposed veccentrica-Hy 'to thev axis ofv oscillation of the jaw, one of the jaws having one lug located in the middle thereof adapted to coactwith my hand in presence. of two subscribing witnesses. Y

' J ULUS KLENERTZ. `Witnesses:

ANTON LEVY, MAX GOLLMERT.

and the in- 

